> first rom page not protected on 505 Roman, this is a 'feature' partially shared with other popular micros. See the programming data sheet for your chip, it explains what is protected and what not. 12C508 also has a similar problem. I am completely stumped as to why they did this. The reset vector readable ?! All subroutines ? Cool (NOT). Should have put the readable window at the top (last page) if at all imho. Peter -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.